Hi,
I want to interface my AC voltage signal (which is coming from transformer) to ADC0808 with 89C51 microcontroller. so prblem is that if i will connect my transformer o/p +ve wire to the analog channel 1 then where should i connect my -ve terminal, i can't connect it to the ground because ground of IC is DC whereas my signal is AC. So please someone help me, i am damn confused....
Thanks for your kind response but actually basic idea of my project is i want to interface my transformer with 89c51 and i will store standard value of voltage , current & Temperature in my controller so if any parameter (i.e. vtg,c/n or temp ) exceeds its defined standard limit so it should display warning msg as well as Value of parameter on LCD display.
Hence i have to take values on every time instant, as per ur suggestion if i will convert it into DC so it will give constant. I am stepping down my supply 440V to 12-0-12 V so peak to peak is 24Volts, & frequency=50Hz
Eagerly waiting for ur intelligent feedback.:shock: